With macOS Catalina Apple will remove the Dashboard from macOS. If you (like me) still like to have some nice, easily accessible widgets have a look at BetterTouchTool's Floating WebView action.
For now here is an easy example that uses a keyboard shortcut to show the desktop and load some simple HTML widgets. Pressing cmd+shift+x will show/hide them.
The widgets are copied from here:
Weather: https://weatherwidget.io/ Clock: https://codepen.io/gau/pen/LjQwGp Calendar: https://codepen.io/khadkamhn/full/vVGBLQ Stock: https://www.tradingview.com/chart/